package org.apache.maven.artifact.resolver.filter;

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *  http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedHashSet;
import java.util.List;
import java.util.Set;

import org.apache.maven.artifact.Artifact;

/**
 * Filter to include from a list of artifact patterns.
 *
 * @author <a href="mailto:brett@apache.org">Brett Porter</a>
 */
public class IncludesArtifactFilter implements ArtifactFilter {
  private final Set<String> patterns;

  public IncludesArtifactFilter(List<String> patterns) {
    this.patterns = new LinkedHashSet<String>(patterns);
  }

  public boolean include(Artifact artifact) {
    String id = artifact.getGroupId() + ":" + artifact.getArtifactId();

    boolean matched = false;
    for (Iterator<String> i = patterns.iterator(); i.hasNext() & !matched;) {
      // TODO: what about wildcards? Just specifying groups? versions?
      if (id.equals(i.next())) {
        matched = true;
      }
    }
    return matched;
  }

  public List<String> getPatterns() {
    return new ArrayList<String>(patterns);
  }

  @Override
  public int hashCode() {
    int hash = 17;
    hash = hash * 31 + patterns.hashCode();

    return hash;
  }

  @Override
  public boolean equals(Object obj) {
    if (this == obj) {
      return true;
    }

    // make sure IncludesArtifactFilter is not equal ExcludesArtifactFilter!
    if (obj == null || getClass() != obj.getClass()) {
      return false;
    }

    IncludesArtifactFilter other = (IncludesArtifactFilter) obj;

    return patterns.equals(other.patterns);
  }
}
